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- fine-ass '22 harvest!
:smoking: hey OTD... looks like pop22 has made some good calls! 
I'm glad you did some research grinding mate, so many don't bother! did you have a look at the sticky's we have here? (https://www.autoflower.org/threads/...panded-to-include-other-issues-as-well.43164/ ),.. there's a text heavy one by JM, in the same place,...using both can help clear the general fog some! Diagnostics are a bitch sometimes, so don't be discouraged by tougher calls,.. I'm still learning too!
...sooo, looks like a couple things here,...mild burnt tips are likely nutrient related, pretty generic for other things too when early on, but at 6.2 nothing is locked out; might be a richness thing, especially after the bat poo... how are you testing pH, run-off, or probe? I strongly recommend using a quality soil pH probe,.. Accurate 8 is a good one form the money,... the run-off method is dubious when done wrong, and is an estimate at best,... let me know, so I can take this into account; we have an improved run-off testing protocol here as well, same section in sticky's,... pH drops in soil over time are the norm, from increased inputs from the plant, depleting of lime, nute inputs,.. hard water can help by adding more aqueous CaCO3,... and of course, a Ca-Mg supplement will help on both accounts! Do you use molasses? there's Ca, Mg some K and a little Fe in there, plus the sugar will ramp up the soil herd, which in turn makes the nute cycling wheels spin nicely for the plant to absorb
--(1 tsp/qt).... 
whoa! No more epsoms, especially at 3Tgal, waaay too much salt input, and risks toxicity, plus messes with Ca uptake,... it's good stuff, don't get me wrong, and it has critically important SO4 sulphur, but again it is a salt,... like baking soda is -(Sodium bicarbonate)..use judiciously!
I'm an outdoor grower too, so I know the various mystery spots, marks, dings and such.. some I can pin down, others no,..
how cool are the nights? Low 50's starts to impair availability on some,...
Bigger, symmetrical bleached-looking spots could be lensing burn from droplets in the sun, which will brown out after the tissue dies; smaller scattered ones I'm not sure,... smaller rusty colored could be a touch of Ca defc, starting, see how most hug along veins? I'm not so sure thrips are part of these symptoms, not distinct enough (thankfully), though some could pass for it,.. they are everywhere outside! I fight them every year, start to finish,.. Dereks pic is a prime example of their damage.. very mobile buggers too, so you may not spot them at the scene of the crime! Neem would have blasted them-- that were around at the time, but supplies are endless,... just for shits and giggles, score some sticky pads, blue or yellow, and place them around the plant ... and see who comes a-callin'!
I'm glad you did some research grinding mate, so many don't bother! did you have a look at the sticky's we have here? (https://www.autoflower.org/threads/...panded-to-include-other-issues-as-well.43164/ ),.. there's a text heavy one by JM, in the same place,...using both can help clear the general fog some! Diagnostics are a bitch sometimes, so don't be discouraged by tougher calls,.. I'm still learning too!
...sooo, looks like a couple things here,...mild burnt tips are likely nutrient related, pretty generic for other things too when early on, but at 6.2 nothing is locked out; might be a richness thing, especially after the bat poo... how are you testing pH, run-off, or probe? I strongly recommend using a quality soil pH probe,.. Accurate 8 is a good one form the money,... the run-off method is dubious when done wrong, and is an estimate at best,... let me know, so I can take this into account; we have an improved run-off testing protocol here as well, same section in sticky's,... pH drops in soil over time are the norm, from increased inputs from the plant, depleting of lime, nute inputs,.. hard water can help by adding more aqueous CaCO3,... and of course, a Ca-Mg supplement will help on both accounts! Do you use molasses? there's Ca, Mg some K and a little Fe in there, plus the sugar will ramp up the soil herd, which in turn makes the nute cycling wheels spin nicely for the plant to absorb
--(1 tsp/qt).... whoa! No more epsoms, especially at 3Tgal, waaay too much salt input, and risks toxicity, plus messes with Ca uptake,... it's good stuff, don't get me wrong, and it has critically important SO4 sulphur, but again it is a salt,... like baking soda is -(Sodium bicarbonate)..use judiciously!I'm an outdoor grower too, so I know the various mystery spots, marks, dings and such.. some I can pin down, others no,..
how cool are the nights? Low 50's starts to impair availability on some,...Bigger, symmetrical bleached-looking spots could be lensing burn from droplets in the sun, which will brown out after the tissue dies; smaller scattered ones I'm not sure,... smaller rusty colored could be a touch of Ca defc, starting, see how most hug along veins? I'm not so sure thrips are part of these symptoms, not distinct enough (thankfully), though some could pass for it,.. they are everywhere outside! I fight them every year, start to finish,.. Dereks pic is a prime example of their damage.. very mobile buggers too, so you may not spot them at the scene of the crime! Neem would have blasted them-- that were around at the time, but supplies are endless,... just for shits and giggles, score some sticky pads, blue or yellow, and place them around the plant ... and see who comes a-callin'!
on the A8! To keep it close to the ok zone, you can keep pH'ing your water with the 'soda, though I'm leery of the Na content in it, Na can become toxic at low levels.... there's Potassium Bicarb' too, often used as a mildew treatment,... another product that has a load of benefits is a Si supplement, and it too can up the pH some,... 
If you water generously, you'll have no issues,....
